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H. S. STRONACH. BORING MACHINE. APPLICATION FILED MAR. 1a. 1918.

Pafented July 29, 1919:

2 SHEETS-SHEET lwuautoz H. S. STRONACH. BORING MACHINE. APPLICATIO-N FILED MAR, I8. 1918.

Patented July 29, 1919.

2 SHEETS-SHEET 2- THE OOLUMHIA PLANOGRAPH 60., WASHINGTON, D. c.

-ter me aXilil line Th ee- UTE. s'r 'rEs HARRY s. smo'nacn, or TACOMA, wn'snmeron.

Bonus-Madman.

Specification of Letters Patent.

Patented July 29, 1919.

Application filed march 18, 1918. Serial No. 223,207.

To all whom it may concern:

Be it known that I, HARRY S. S'rRoNA'cH,

a citizen of the United States, residing at Tacoma, in the county of Pierce and State of lVashington, have invented certain new and useful Improvements in Boring-Machines, of which the following is a specification.

The present invention relates to boring machines and more particularly to wood boring machines for boring out pedestals, bal usters, posts and the like.

It is the object of the invention to provide a boring machine which combines speed of operation and accuracy.

To this end, the invention comprises a hollow shaft having athread of very Wide pitch on the outside and a shiftable support for accuratelyholding the shaft on a fixed axis.

' A more particular object is the provision of mechanism for accurately supporting and guiding a threaded barrel adapted-to bore holes of different diameter in a single operation.

The invention will be more fully described in the annexed specification and more particularly defined in the claims.

In the drawing,

Figure 1 is a side elevation of a machine embodying the invention;

Fig. 2 is a fragmentary view of the shaft showing the thread on the surface thereof;

Figs. 3 and 4 are sectional views on lines 3-3 and M respectively;

Figs. 5 and 6 are a plan view and end View of the support for the shaft, and

Figs. 7 and 8 area cross-sectional view, and side view of a detail. I

Having reference to Fig. 1, 10 represents a suitable frame having the usual guide rails 11 on which is mounted the operating mechanism of the machine. The operating mechanism comprises a pulley 12 mounted on uprights 14 of a frame 16. -17 is a carriage movable along the guide rails 11 and carrying the column or stock to be bored. The hollow shaft which comprises a front portion 18 for boring a hole of relatively small diameter and a rear portion 19 for boring a hole of larger diameter is secured to the pulle 12.

Sup orts 20 and 21 enga e the shaft indiate its ends to. hold it in a fixed e ehaftis provided on its enter one see with a thread, preferably a double thread of large pitch whichextends over the shaft substantially the full length thereof. The height of the thread on the front portion 18 is proportional to the diameter of the hole to be bored thereby and the height of the thread on the portion 19 is plrcliportional to the diameter of the larger The front end of the barrelis provided with the usual cutting lips (not shown) and a reamer is secured to the shaft to enlarge the bore made by the former.

Fig. 2 shows the point of the shaft where the reamer is' attached. The double thread 26 which from the front end of the shaft to the reamer has, as has been stated, a height proportional to the size of the bore made by the auger, is continued toward the rear end of the shaft, but its height is increased in proportion to' the counter bore to be made by the reamer. a

The reamer knives 27 and 28 (Fig. 6) are preferably inserted in channels 29 in the crest portion of the enlarged thread 31, and secured therein by a Wedge element 32 forced against the body of the reamer by means of a screw 33 or in any other suitable way.

At the point where the height of the thread is increased, an off-set 34 is made in the double thread for a purpose to be subsequently described. The reamer is so dis posed that its cutting edge 30 projects into the off-set 34.

The supports 20 and 21 have at their upper ends angular seats 35 in which is fitted a stationary box 36 composed for convenience of two halves 36' and 36". This stationary box has a cylindrical opening which forms a bearing for the cylindrical box 37. The cylindrical box 37 (Figs. 7 and 8) has internal ribs 38 and 39 to engage in the grooves of the thread and bear with their inner faces 40 upon the bottom of the thread. These ribs are of such height that the space between them can accommodate the reamer and provides a clearance 41. lVhen the box 37 is exactly'over' the reamer knives, the ribs 38 and 39 clear the knives 27 and 28 as indicated in Fig. 6. The stationary box 86 has flanges 42 and the cylindrical box 37 has flanges 43 to prevent relative lengthwise To'facilitate the taking a" art of the varione elements, the supperts e and 21 have re-lAQ movaliie iiiegcil }1553s; 4. mgflaaafaaya attached by means of stud bolts 45 and nuts ,Afior in any other desired manner. 1

end of the shaft as the column or stockto be bored is advanced. I dovnotalimit myself; to

any particular arrangement in that respect, since/motion m'aylbe imparted to thesup- 'portsfin various ways andby various means, dependently or independently of each other. The operation of the device is asfollows: The-shaft is rotatedby the pulley 1-2 and the carriage 17 is advanced; As the carriage moves along guide rails 11, the supportsQO and 21 are gradually moved to the right.

During such motion ithe cylindrical box 37 revolves with the shaft and the ribs 3Sand 39 slide along the grooves of-the thread.

Since the thread is continuous,-the cylindricalbox'can passfrom' the thread'of the front portion 18=over the thread 'of -the rearpor- :tion 19 and' since thecu-tting edgepr'ojects into the offset 34:, which -is Within the confine's of. the thread, the box 37 can over the reamer. 'The supports therefore pass over the full" le1'igth of the shaft as 'if the shaft were of iuniform diameter. .The

ribs 38 and 39 engage the bottom'of the thread and thereby hold the shaft in a fixed The thread 19 carries the savv dust rear- Wardly and thereby clears the reamer blades. The thread 18 performs a similar function.

However, a conveyer screw or worm 47 may work Within the shaft to more rapidly remove the sa'w dust and shavings from the bore and clear the auger. This conveyor screw -17 may be driven by a pulley 13 mounted on uprights 15 of the frame 1.6 or other suitable means. Constructionsof this kind are Well known and do not form a part of my invention. i

Iclaim;

1. In a boring machine, the combination of a shaft having threads on its outer surface and a support for holding the shaft on a fixed axial line, said support having means to bear on the bottom of the thread,

j 2;In a boring machine," the combination "ofa shaft'having threads on its outer surface and a shiftable support for holding the shaft on a fixed axial line, said support'hav- 'ing means to bear on the bottom of the thread. I v I 3. In a'b'oring machine, the combination of a shaft having 'its outer face threaded and adapted to bore holes of different diameters and a'supportfo'r holding the shaft on a fixed axial line, said support having means to bear on the bottom of the thread and being shiftable along the shaft substantially the full length thereof.

' along 5*42'ZI1i a' boringjm achine, the combination of ashaft having a thread on its outer sur- 1 face, a supp ort, an, element revolubly mount- The supports orpedestals'20and2l'are 5 constructed to have sliding movementalong rails 11 and suitable means may be provided; whereby they are moved toward the rear ed in thesupp'ort "and having means to bear onthe bottom of the thread of the shaft.

4 5 In a boring machine, the combination of ashafthaving a thread on its outer surface, 'a' support adapted to be shifted along the shaft, an. element revolubly mounted in the support and having means to bear on the bottom of the-threadof "the shaft. 5

6'. In a" boring niachine, the combination fof ashaft havingfa portion adapted to=bore a hole'of relativelysmall diameter and a portion adapted-to bore a hole of-larg'ei' diametenfa thread on the outer surface of the shaft, the-height of the said-thread varying'in accordance With'tl1e different bores to" be made by the said gportions, a support, an J elementrevolubly mounted in the support, said element'being'constructed to-have sliding movement relative to'the: shaft over substantially the full length thereof and -hav ing means to bean' 'on the bottom-of-the thread-s 7. In -a bo1fing machine;thei'combination of a shaft having: a; frontv iportion adapted to bore a. hole of f relatively small diameter and a reamer adapted. to bore a'rhole of larger diameter,'"a thread :on' the outer surface ofthe- :shafti and extending along substantially the full length of the shaft, i the height' of the thread'vaiyin'g in accordance with the different bores to be made by the front portion and the reamer respectively, a shiftable support, an element revolubly mounted in the support and having means to bear on the bottom of the'thread,-said element, reamer: and 1 thread behind the reamer being so constructed and arranged that the support and said' element may be Shifted substantially the full length of the shaft. Y

8. In a boring machine, the combination of a shaft having a thread on its outer surface along substantially the full: length thereof, cutting lips at the front end of the shaft and a reamer blade intermediate the ends,;the height of thethread between the front end and the reamer blade being determined-'by -the size of thecutting lips and the height of the thread behind the reamer blade being determined by the'size of the reamer blades, part of the thread being cut away to form a'lateral offsetinto which the cutting edge ofthereamer blade projects, a shiftable support, an element revolubly mounted in the support, said element having a projectingportionbearing upon the bottom-of the thread and contacting with the sides thereof.

9. In a'boring machine, the combination of a shaft having a thread on its outer surface aportion of the thread being cutaway define an off-set, a reamer mounted on the thread so that its cutting edge projects into the said off-set, a sup-port, an element revolubly mounted in the support, said element having a projection engaging in the groove of the thread and bearing upon the bottom thereof.

10. In a boring machine, the combination of a shaft having a thread on its outer surface, part of the thread being cut away to form a lateral ofiset, a reamer blade adjustably mounted in the thread and projecting into said ofi'set. 11. In a boring machine, the combination of a shaft having a thread on its outer surface, part of the thread being cut away to form a lateral offset, a reamer blade mounted Copies of this patent may be obtained for in the thread and projecting into the offset and means for adjustably securing the blade in the thread, said means comprising a wedge-shaped element positioned in a recess in the thread and bearing on the blade and means for forcing the wedge-shaped element against the blade.

12. In a boring machine, the combination of a shaft having a multiple thread on its outer surface, part of the thread being cut away to form lateral ofisets and a reamer blade mounted in each thread and projecting into the offset.

In testimony whereof, I affix my signature,

HARRY S. STRONAOH.

nve cents each, by addressing the "Commissioner of Patents, Washington, D. 0. 

